261527601 has 4 divisors (see below), whose sum is σ = 348703472. Its totient is φ = 174351732.

The previous prime is 261527587. The next prime is 261527633. The reversal of 261527601 is 106725162.

261527601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 261527601 - 2²⁶ = 194418737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261527681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43587931 + ... + 43587936.

It is an arithmetic number, because the mean of its divisors is an integer number (87175868).

Almost surely, 2^261527601 is an apocalyptic number.

It is an amenable number.

261527601 is a deficient number, since it is larger than the sum of its proper divisors (87175871).

261527601 is an equidigital number, since it uses as much as digits as its factorization.

261527601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87175870.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 261527601 is about 16171.8150187293. The cubic root of 261527601 is about 639.4979795242.

The spelling of 261527601 in words is "two hundred sixty-one million, five hundred twenty-seven thousand, six hundred one".